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PermaSEAL Damp Proof Paint 5L

100% of 100
£32.50 Ex VAT
£39.00 Inc VAT
A high performance multi-purpose damp proof paint that stops damp and vapour.

Damp Proof Membrane Paint

PermaSEAL Damp Proof Paint is a high performance liquid damp proof membrane. All you need to do is brush or roller it on to a sound masonry surface to create a damp proof and vapour proof layer.

  • Forms a flexible membrane that stops water & vapour coming through, reducing the chances of damp forming 
  • Blocks penetrating damp on interior walls and ceilings in two coats
  • Highly effective damp proof paint for internal walls that can be applied to damp surfaces 
  • Can be painted over with standard emulsions or wallpapered over when dry 

This high quality professional product can be used as a general damp proof paint for walls and ceilings as well as a highly effective damp proof membrane (DPM) for floors. 

With a consistency similar to thick emulsion paint, it is available in two colours:

  • white damp proof paint
  • black damp proof paint

Benefits of PermaSEAL Damp Proof Paint

PermaSEAL damp proof paint is a highly adaptable and powerful multi-purpose product. It is:

  • Fast-drying
  • Ready to use straight from the bucket
  • Fully waterproof
  • Solvent-free 
  • Professional product
  • Dries to a semi-gloss finish
  • Stops damp and vapour damaging decorations
  • UV resistant

Damp Proof Paint Uses

PermaSEAL damp proof paint is a multi-purpose high performance product. It can fulfil a range of purposes, including:

  • A general interior damp proof paint for multiple surfaces including render, plaster, brickwork. Suitable for both walls and ceilings.
  • Floors: a damp proof floor paint that can be applied above and below screeds to provide a damp proof membrane. It needs to have a further coating to protect it from damage.
  • Walls: a damp proof wall paint that can be used under a render as a waterproof layer.
  • Externally: below ground as part of a tanking slurry system behind a cavity drain membrane (Speak to our technical advisors).
  • Tiling: under tiled areas as a secondary protection for wet areas such as bathrooms.
  • Bunds, silage and sewage tanks: protects concrete from silage attack.
  • Gas Barrier: protection against methane and radon penetration.
  • Timber: joist ends can be waterproofed before installation into damp walls

Note: Speak to one of our technical advisers if you are considering using this product in a basement as there are risks involved.  For areas of water ingress under hydrostatic pressure we suggest Permaseal Tanking as a waterproof barrier.

How to Use Damp Proof Paint


Make sure that all surfaces are sound, free of loose material, dust, oil, grease, rubber marks etc. PermaSEAL Damp Proof Paint should not be applied over any previous coatings like emulsion paints and bitumen as these can stop it working or bonding effectively. 

When using as a damp proof paint, ensure that any masonry / brickwork is flush and pointed. All defects in existing surfaces should be made good. Ideally, you want a smooth surface with a trowelled or brushed finish. 

When using as a liquid DPM make sure the substrate is load-bearing, and that any laitance is removed mechanically (common on new concrete floors/screeds). Speak with a technical adviser if unsure.

How to apply Damp Proof Paint

Before applying the damp proof paint, stir the contents of the bucket well. The damp proof paint is now ready to be applied by brush or roller. It’s that simple. Follow decorating best practice.

When using as a damp proof wall paint for treating internal walls, the best method is a sandwich system. This is where you chip off the render and then apply the damp proof paint before applying new plaster. 

We recommend two coats are applied for all purposes. All subsequent coats should be applied at right angles to the previous coat. 

Before applying a second coat, allow the first coat to become touch dry. This is typically within one hour. The second coat should be applied within 24 hours of applying the first coat. Once the second coat is dry, you can paint over it, or apply further decoration such as wallpaper.   

How much Damp Proof Paint do I need?

To achieve a damp proof barrier, PermaSEAL Damp Proof Paint must be applied as specified and not stretched to cover larger areas. It has a coverage rate of 1 litre/m² when applied in two coats each of 0.5 litres /m². For more details click on the FAQ tab. 

You can read reviews in the review tab, highlighting why PermaSEAL is the best damp proof paint on the market.

PermaSEAL - Complete solutions. Made possible.

PermaSEAL damp proof paint is part of our complete PermaSEAL range of damp proofing products where quality, value and technical excellence come together. If you have questions around the way this powerful multi purpose product can be used, give our team a call. You can also read our FAQs in the tab where we cover some of your commonly asked damp proof paint questions.   

Related Content

Return to our Damp Proofing Products section to browse more items. Read our Guide to Internal Damp Proofing. If you still have questions then read our article on Does Damp Proof Paint Really Work? 


  • Ready to use straight from the bucket
  • Single pack system - use what you need and then replace the lid
  • Water-based product 
  • Can be applied to a damp background (no surface water)
  • Solvent free and plasticiser free - non toxic, non hazardous
  • Quick drying - typically touch dry in 1 hour leading to quick recoat times
  • Good bond to many substrates
  • Highly effective damp proof paint for internal walls 
  • Professional damp proof paint for concrete floors
  • Toughness, high flexibility, extensibility and good crack-bridging properties
  • Available as white or black damp proof paint
  • Low water vapour permeability
  • Alkali resistant & also resistant to silage acids
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